# std::valarray<T>::shift

From cppreference.com
< cpp‎ | numeric‎ | valarray

valarray<T> shift( int count ) const; |  |

Returns a new valarray of the same size with elements whose positions are shifted by count elements. The new position of each element is i−count where i is the previous position. The value of shifted in elements is T().

### Parameters

count | - | number of positions to shift the elements by

### Return value

The resulting valarray with shifted elements.

### Notes

The function can be implemented with the return type different from std::valarray. In this case, the replacement type has the following properties:

  - All const member functions of std::valarray are provided.
  - std::valarray, std::slice_array, std::gslice_array, std::mask_array and std::indirect_array can be constructed from the replacement type.
  - For every function taking a const std::valarray<T>& except `begin()` and `end()`(since C++11), identical functions taking the replacement types shall be added;
  - For every function taking two const std::valarray<T>& arguments, identical functions taking every combination of const std::valarray<T>& and replacement types shall be added.
  - The return type does not add more than two levels of template nesting over the most deeply-nested argument type.

### Example

Run this code

    #include <iostream>
    #include <valarray>

    int main()
    {
        std::valarray<int> v{1, 2, 3, 4, 5, 6, 7, 8};

        for (auto const& val : v)
            std::cout << val << ' ';
        std::cout << '\n';

        std::valarray<int> v2 = v.shift(2);

        for (auto const& val : v2)
            std::cout << val << ' ';
        std::cout << '\n';
    }

Output:

    1 2 3 4 5 6 7 8
    3 4 5 6 7 8 0 0

### See also

cshift | circular shift of the elements of the valarray (public member function)

Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/numeric/valarray/shift&oldid=160816"